NDLI: Active aerodynamics control of simplified vehicle body in a crosswind condition

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Active aerodynamics control of simplified vehicle body in a crosswind condition

Content Provider	IET Digital Library
Author	Nakashima, Takuji Yan, Chao Moriuchi, Takashi Kohri, Itsuhei Mutsuda, Hidemi Doi, Yasuaki
Abstract	In this study, the authors used a steady jet from a slit nozzle to control the bi-stable aerodynamics of a simple vehicle model under crosswind conditions. In general, the aerodynamic coefficients of an automobile change continuously with variations in the relative wind direction (i.e. yaw angle). However, some vehicles show a significant change in their aerodynamics at a certain yaw angle because their wake flow structure changes at that yaw angle. Furthermore, around that critical yaw angle, their aerodynamics sometimes show bi-stability in which both the wake structures before and after the change are stable. The investigated model is the famous simplified model in vehicle aerodynamic research known as the Ahmed model. Its slant angle was set at 32° as a configuration that causes bi-stability at a specific yaw angle range larger than 6°. The active aerodynamic control method was demonstrated in both the model scale wind tunnel test and computational fluid dynamics analysis. The slit jet with 18% of the main flow velocity successfully changed the wake flow structure. This showed that it is possible to improve the aerodynamic characteristics.
Starting Page	1005
Ending Page	1011
Page Count	7
Volume Number	2020
e-ISSN	20513305
Issue Number	Issue 14, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/joe/2020/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/joe.2020.0062
Journal	The Journal of Engineering
Publisher	The Institution of Engineering and Technology
Publisher Date	2020-08-11
Access Restriction	Open
Rights License	Creative Commons Attribution-No Derivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Subject Keyword	Active Aerodynamic Control Method Active Aerodynamics Control Aerodynamic Characteristic Aerodynamic Coefficient Aerodynamics Ahmed Model Applied Fluid Mechanics Automobile Automobile Change Bi-stability Bi-stable Aerodynamics Computational Fluid Dynamics Computational Method Critical Yaw Angle Crosswind Condition External Flows Famous Simplified Model Flow Visualisation Fluid Mechanics General Fluid Dynamics Theory Investigated Model Jets Measurement Instrumentation And Technique For Fluid Dynamics Mechanical Component Mechanical Engineering Model Scale Nozzles Numerical Approximation And Analysis Relative Wind Direction Simple Vehicle Model Simplified Vehicle Body Simulation Slant Angle Slit Jet Slit Nozzle Specific Yaw Angle Range Larger Than 6 Steady Jet Vehicle Aerodynamic Research Vehicle Dynamics Vehicle Mechanics Wake Flow Structure Changes Wake Structure Wakes Wind Wind Tunnels Winds And Their Effect in The Lower Atmosphere
Content Type	Text
Resource Type	Article

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